Found this montage of career highlights for Nakajima: https://www.youtube.com/watch?v=fD_3zgKA-UE
It's mostly his offense, but he clearly displays the ability to use the entire field and hits for power to all of it (although he's mostly a pull-hitter when it comes to power). Some of the highlights include a big hit off Roy Oswalt in the WBC at Dodger Stadium, a diving play into the first row seats at Fenway Park during the WBC, and a few walk-off jacks toward the end.
He also seems to be slightly more jovial and smiling than most of the stoic Japanese players who've emerged in MLB. I'm excited about the possibility of the A's signing him now. Could be this year's Cespedes?